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Tous les autres exemplaires originaux sont film^s en commenpant par la premidre page qui comporte una empreinte d'impression ou d'illustration et en terminant par la darnidre page qui comporte une telle empreinte. The last recorded frame on each microfiche shall contain the symbol m (meaning "CON- TINUED"), or the symbol V (meaning "END"), whichever applies. Un das symboles suivants apparaitra sur la derniire imago da chaque microfiche, salon le cas: le symbole — ^ signifie "A SUIVRE '. le symbole V signifie "FIN". Maps, plates, charts, etc., may be filmed at different reduction ratios. Those too large to be entirely included in one exposure are filmed beginning in the upper left hand corner, left to right and top to bottom, as many frames as required. The following diagrams illustrate the m-thod: Las cartas, planches, tableaux, etc., peuvent etre filmAs i das taux de reduction diffirents. Lorsqua la document est trop grand pour etre reproduit en un seul clich6. il est film* d partir de Tangle supiriaur gauche, de gauche A droite, et da haut en bas, en prenant la nombre d'images n^cessaire. Les diagrammes suivants illustrent la mdthode. 1 2 3 1 2 3 4 5 6 DEPARTMENT OF THE INTERIOR CANADA Hon. W. J HocuE, M'Utter. W. \V. Cort, CMC, Depulj/ MmitUr. PUBLICATIONS Dominion Observatory OTTAWA W. F. KixG, C.M.G., LL.D., Director. Vol. II, No. 13 /) Orbit of B.A.C. 5890 BT T. H. PARKER, M.A. CAl MT i+03 P02-13 OTTAWA GOVEKNMENT PRINTING BuREAU 1915 .•a^v= '"rniF pni YTFrHNIOUE BIBLlQIHEOilF I L>-v, ,L_ I p]V' inyurAiir DEPARTMENT OF THE INTERIOR CANADA l!,,v W .1 R.KiiK, U.u.vr W. \V. CuKY, C.M.U,, />fj a spcctroscupic hiiiary hy Mr. Hums fruiii tlu' iii-asuivs of a plat.- ohtaiuctl at tlic I.ick ( )l,.s,>rvat(.ry oi. .lun.' 21, I'.tO.".. This plate showed a .louhlii.n of the lines with a rati., of intensity of about two to one. Two plates ha.l l.een previously ol.taine.l in IS'.K) aiul \m) which had only sinsjle lin.'s. In .\. .1. Vol. 27), a list of measures of ei^tht plates is ^iven. Of this series three (iave the veh)eities •)f i ulh (•onii)onents with a ran(;e of i:.l km. Th<' star is an F-typo, with fairly broad lines and is of photoRraphie magnitude 1-9. The following orbit was determined from the measures of nineteen I)lates taken at Ottawa showing both spectra, together with the three Liek observations already mentioned. A larne ntunber of plates of this star were obtaine.l here, which were later found to be unsuitable in the determination of the orbit on account of the blendinfi of the two spectra. The latter were only found separated near the primary maximum. Fortunately, however, one of the Lick observations showed double linns at a i)haso near apastron due to the larger dispersion of the Mills spectrofrraph. The velocities given by this plate were of great use in finding the values of K in the case of each component, as will be noted later. In all thirty-one lines were measured on the various plates of which about a dozen occurred but a few times. A selection was made of .>l<'ven of the best lines remaining for which the wave-lengths were corrected as follows:— TABLE I. KItnnonl. Iron MaRneeium . Mapiesium-Chrciiuium.. Hydro|!;(?n Iron Iron. . Wavp-I.en(jth. 4549-7.53 4481-548 4:5.52-035 4340-t)4« 4271-680 42PO-B54 Elf-mpnt. Magnesium-Iron. Iron Iron. HydroRpn Iron. Wavp-I^ngth. 4233 483 422rt-968 4143-832 4101 890 4045-935 ;i:v.' I'l lu.n \ 1 1"^- "I I 'I' "" IkiMIMkN li|l-ri(\ \i"in .,.(1 III I'lir fcillnWIIIU >nluli<)ll-. TIlCSC .litrrillilir.l llnlii ;i ili-cu--ii>ll "I ill"' \ ^uniMKin nf ,1„. ,.l..■.■^M.lo.l~ iM.l 1^ .-'.I in Hi- (-..U-in. '.M... ,„ T,!,!,. II uill 1>. lo'.ml tl,.. l.ii'k ..i.Miva.iun^ .^uulz Hh' M'loni,..^ a~ W„„llv , Miunii.in.l irnin .!.• iluv,-,.,- I.v 1 VM v. ,1,,. .lulian ihv U,r r:.U ,,,,„;,„,„.,,...,.„ ..,.. pn.viui.lv 1. .Ill l—n.,1 .ha, ih. v.lu..^ -., ll,- ,,,„,„v ,„ ,lu. tal.l.. :. n-.n.llv u.r.rA. .,v ^li.liUv .iilTiTi..,, rrnin .Im.. nli-failN |Mil>li>li- ,l,an .lio^. ..v-n l.v ,li. U.nurr nu...nr<. .,-.,,,l„ n, ,,„„„ns ,lu. Ottawa ul.Mrvati.Mi- a.i.l, a- in Tal.lr H. ." '^'H. .,... ,1,. pha.. 1^ .-kuni.a ftnn, p-naMiun a.i.l tii,. ivM.lual In,,,, th. hnal curve. rif MicaMirc^ air ^^ivcn in .Inail alt.T Tal.lr HI. I Mll.l II l.K K ()llSi;i!\ \ Til INS l'l:ii.: Date. Jilll:in l):i>. lis.-ill! .lunr Jl 4:i.'4» July 'JJ 1 434SA Aug. 1 1906 1906 OMl'OSKST 1 CiMI'MSI-Nl H- Vol. O-C. Vcl. I 0-C. , 117 (11S vJ^ Ji'i Hit »14 79") 1 fitiO 424-714 11000 •+6»0 +t)9t) +20 +2SS -■Jilb .-.5.0 -o.( -l.fi +0 4 ■-h-^.O -80 1 -til >-:!i 01 -31.2 +0 5 +.10.0 +3.;i •Values publi!'h«l in L.'JM. vol 1. p '.•>' iKIIII "t HA I :>S'M). 333 put*. D.iir .1 177 3.'>0(i 3.W7 4310 422B 4;«)7 441R 41J1 4 m\ 4'i()J 4.Vltl 4:>9:. 4I).W 1" ll-c I" (• II I" p (' II H C II (■ J Illy April 111 April .'II M:iv Hi July li .Iiih 7 Aiii: 1 AiiB -"■' Sept ."J SopI "Jl* \(M I'.t I'.l.'l I', ■i'.i7r. 1" .■itii.-i I' riofli C-II .^17.! c j.589 C-P' I'.tU M:ir 2:, \pril JO jiiin' r_* Jiinc Ki Auif. .!'■> I'.ilii Jiini' 111 IKt 6.-. 07 74 S4) M 74 tw 75 70 72 KM) 00 90 r\iii.i III riTTAWA OnSKUVATIONrt. .Iuli:in Day ItlUM'. 2.4IS.S3.; 7W s:,7 (i!i."i '.no mr. iiiCi s7:t 117 N."ill 17:i >>l'.t 221 ii:i:i 22:i iitio 2."iO .".'i 27S .•>; 1 ;!i)2 r.22 :i(H'i .'ii:, :i2u .'iiNi 4>i7 W2 .-,i;ivt:i .VHi ■ 77:i .")(i7 742 lilt o." 935-743 II ILirpfr; ( iiMIMM ^T I {'OMPOVKNT II. Vol Wl. (>-< R75 2.". 774 Jii i:ri 25 93(1 11 i>lt (I :;ii3 21 h7.1 2.". i.HKI 21 .-.11 2ti ■ 211'; 23 939 1 li:iS 24 1113 2.'i IlKI 2.'i().'i7 25 4 IS 143 21 110 0-3(V5 +44 -H +68-6 +83 +74-8 +t'.l-9 +(m I +1(2 ■»> + S0-3 + 4tiH +65 +25 + 43 +52 + 73 + 529 + 73 II +tl4ll +51-8 +8l-t> Vel. Wt 5 If) 5 4 4 4 3 4 4 9 9 - 4 - 3 -I4S + 12-8 - 3-9 + .■!■ 3 — 7 ■ .") 1 + 3 11 00 .'l + 20 1 + lfi-3 -57 -717 -76-9 -1581 -flOH -81 -.V) -58-9 -tVIB -71 8 -HI-9 -27 -6 -71-8 -04 4 -82-tl! -tlti-9 -tl5l -40 -80- CM" - 4-8 + ? « - 3 6 + 10 3 + 3 9 - 4 + 10 i + 15 ■> + 1 I -19 8 + 5 7 -15 5 + 8-5 -19-0 + 3-3 + 411 + 5-7 -119 847;}7 ■.VM I'l lU.lt AlUlNS OF IIIK DdMlNlON nlf-KHVA TOKY. u:: p* Vrl \M 4481 4:!52 4'-'71 4-tV) 42:i;i A2-X 4M:i 4101 404:> ■:.:! ,vis (lit". iwt 1).- 1 4s:! 'ir.s s:v' ■035 :il77 Mi:\srKKs (IF 11 A (■ :t:>oii |i \.l \Vi v,i , \Vt \,i \\i :;.-,s, i> + :i.-) •Ml: + 34-20 -t- MM + .". 4.i 7.MS 2lMi3: + 77-Mi Weight oil mnnn V, Curv. • (1 '17 ■If. + co--)r) + 9H-4.1 + SI -24 + 73-13 -+- NS- 14 ^+ S7-27 1+ 7S--7 1+ H(I-3V (II 24 Rndiiil Velocity + 44 -S ■'.(■.■.;i - 10-04 -00 2S -t- (IS- - 20-33| - SS-'.tol - 70-Bi)j - (is S3i ■i(i (I'.i .■>S-S0, 52 -m! 53-52! 35-751 - CO 71 _ 10 114 ■00 V.-l \Vl ^ o2-oi; ; f 01 00 ; + i(Hi(n \ los 20, 01 so Vi-I, Wt 02 31 20 04 -10 -2S + 05-0 Vcl. Wt. 70 10 5()-00| 40 0Oi 50 Oo' 42-30i i 40 52 20 04 -10 ■23 •p. = primary, p =ser(iTia:iry. - V^. .. ■''j?v'^kf^k^im^^];l::m^ ■K', ^-•=y- )HBIT OK B.A.r. 5890. 335 MEASL'RKS OF B.A.C. 5890— Coii/inufd. 4219 p 42:,) H. ■::r, p 4226 H 4307 p 4307 8. X Vi-l, \Vt V.-l. \Vt. \\-l. \Vt v.. \Vt V.'l. \Vt Vi-1. \\1 Vcl. Wt. 4540 753 f 59-61 + .56-50 f I)!' -99 -I-- .58-80 + .WO*) + 46-63 1 1 « i 1 - 73-83 -101 02 - 85-45 - 73-27 ! 1 4 J + 60-01 + 33-76 + 39-61 + 36-82 f 35-07 T 31-17 ! J •2 i i I 4 - 80-25 i + 56-90 I - 49 ,84 i 4481 -.'■i4S 4352-03.) 43-10 646 4271 689 4260 654 - ,87-22 i + 52-39 + 58-92 + 47-16 i i -111 -.56 i 4233 - 483 4226-968 - 64 76 i - ,58-77 i 4143-832 4101-890 Weiffhtod mean V. \4 Ctirv. + 52-98 + 22-09 -02 - -28 - 79-86 + 22-09 ■02 -28 f 40-48 + 21-79 - -09 ■28 - 78-36 + 21-79 m -28 + ,54-45 + 12-05 12 •28 - 93 48 + 12-05 - 12 •28 Radial Velocity + 74-8 - 58-1 + 61-9 - 56-9 + 66-1 - 81-8 ^":'.7 ;{;3(i ITin.lC.VlIONS OK TIIK. D.'MIMON i IHSKRVAl nH Y. Mi;\srHi:s ov hac. :,sw--i;,uii>,n.d ,,.w;__. ^«F-l.VT ?;i:J;^«v^ :--'Vv^ .■'-Vi:.;M-'iK,-,A- ^ - Jg-TT-'J^ '■.■'' '' t^"i^-»;-: ^^•^ OUBIT OF B.A.C. 5890. a;}? 4tSl ■ 4.il(l 4L'71- 4J(10 4L;;!:i 4JJ(i 414:1 4101 404.") .-,4S ii::.") I>4() liSlt (■,.')4 4W («),S MX) y;i,"i ME.\.SURK.S OF ll.A.C. nS'M—CunUuueii. 4u;i'i*(. Vcl. \Vt + S5-4<) f- 70 10 liTlo; lliiii's. V.'l. \Vt WciKlUcd iiit'un V. Vi Curv. f (■,:!■ so; + TlCiO - ■.'IW) (XI ■ 2S Vi'locilv •Jl-9.'> 41-70 4.-,;»J p \el. \Vt + '.is-4:i| + l(X) .■>:!; -t- 01 -oil + .s:i7li 4.50'J \el. Wt ()0 1l> 14 SO ■21 m IKI ■ Js + 01 or; i 02 74 ■J7-J0 ■ II) ■ L'S 4- 40- ,jO M ■.'4S4 .'•il-.")! 44-70 4.")S() p Vcl. Wt Vel. i Wt. \\-l Wt. + .•)y-7()i + 31-47j + 40 -42' + cj-y 21 (VJ 44 1-' ■'7 20 11) ■js 4J-S0; + tK) 71 S -111 -2s + 2.".- - 33-71 10 2S 01-0 •Chei'k iiieu.surcs v<;r rvl.', -,*-;-?> Vi*^ '^> ■ .3 1.--- ^ -r , ;!:5s IM HI.KAl lu\S OK IIIK DiiMINHiN ()H>K1!\ \l( lUV. Mi:\SI l{l> III li A t'. 5890— Condnwrf. -i.-.m ::..! 44M .MS 4;i.V2();i.") 4;!4(l iVlli 4271 liVI 4jri(i i;,-,i 4'j:i;i 4s:i 4JJI) '.«;s 414:is:;2 41111 >!KI 4111." '.i:;.' I.-.'.I.-, I. V,l \Vi iiiiun \,. V,, Ciirv. + S7.',I4I + 711 !i:t (12 S'li 71 (Kl \A \\I Radial V.locitv r 1 .'2 J7 :ii; is + ifi OS' ; *- jasii ; - ■Jj.'.M i - i:i s.-, ; 1 1 ji I is — .Js 4ii.'ri |i \ .■! W t \,.i ; \vi f.lJl 1. V,.l. \Vt t- 4:i 4 21 •2S - is-r,;. i Is 1,1 24 .2S (iii ()2i 1 i -t- :is:iii i + 211 41, i V,l '\V|. 7Mt • 41. 211 r 27.02 f .04 ■28 !i:i is i '.17 2:i i ll!l.07l J 730 SIMS j 4:ii() 4-.'71 4J(i(> ■ISS.i 4-J-'H 4M:i 41(11 4045 7.j:( ■)4S o:i:i ill(> (■)MI ii.-)4 4Sf yijs s:ii; y.Ki y3i + 4'.K) i r I + :!J74i 5 + 57 -rj I- :wo2i i WflKlilccl tlic:in v. Curv. Kai!:ul N'l'loellv + ;iiij-' f Jl-.J.-> f 04 ■JS 2-9 \ .■[. : W t -i;i2 10 ■104 40 - TS-Toi 501.") (J \,1. \Vt + lo:MV-'i 1 + liJIil), i T T.s-Tiij i - 47 s'-,; ; + 72 04: i -10108 - 21-55 01 4- 7;i-'J4 ■7"> + -07 r:i-o 5045 \ul. \Vl 5'J-2'J ■51 05 yo •7.S ■07 ■2,S m-'j ,5051 iJ. \'A. W I + ■IS ■12' i + 00 ■so! 1 + 7;i 13 S + 00 22 - 1-2S - ()7 - ^28 + 044 5051 « V,.|. \Vt 5:r.50 00 so; ; VlK ■ \Vt - 03 47 - 1^2S ■07 - ■2S 65^1 AM) IM lll.H \ I lii\> UK rilK PiiMlMiiN ullsKin Al i IHY. MKASIURS OK B.A.C;. 5890-<'unWmied. X .-.ITJ |. .■„7. \\i .-,.>•! |. :i:.y» ^ \cl \Vt \'.'l \ . ! \Vt V.-l Wi 1 \Vl vv, 1 \Vt Vol. \Vt. ci'i T."..; r (;7a> 1 1 1 4I^1 .'il^ + .vj 117: ; ■i:i."i.' u:i."i 4.iiii iin; - '17 .-,'. 1 . M .V, ; — 77 ^*J 4J71 lis'i . liKi ,;i , 42ii() ii.M 4J:i:! is;! 4JJii iltls 41i:; s:iJ 4IIII v:«i 1 - mi:, ',i:;.". - ^iMn [ I'l 1':; ; llir.ill - 7'.i .M l^■>^'l • St:.:. - 77 N_* \,, -■ J7 ;i."i _'7 ■ -!■' '_* :).s ■J ■ ."iS V, 11 1 1 - 'J^ ■-'H li:Hl.:,l \ floiity • .-.Is - 4i',.r, ^- SI r> - M) 7 Tlic nineteen Ottawa ohservations were ^roiiiK'il into live normal places, am! those from Lick \\ 1 ^.".l +.IS-5 15 ■(- Oo 4 ■J IJl +2«0 1-5 - 0-5 8 1.' lilil -JoO 1-5 - 1-4 \t ^jlOS -.Vl 1) Oo -11) 5 W 25 0(10 -r.l-.-. 0-5 - 2-4 11 It JJT -W 2 15 + 10-7 u II ."iliT -820 10 -10-2 in OMs -TIM) 1-5 - ti-5 11 1 MMI -^4.-. .-1 0-5 - 24 in ■JlJl -:>1 1) 10 + 9 Ul U :i4ll 4-:iii II 10 + 11-8 I'siiifi the grapliioal inctliod, these preliminary elements were obt: ;ned: — /' =26 -2742 days t = • 55 a), = :i5()° CO, = 170° A'l = 50 km A'., = 47 -3 km. 7 = -2 -OS km. T =2,418.410-794 J. I). .\s i)revi(msly noted, one of the Lick observations was a 5j;reat help in fixing tlH> values of K, and A', above. This plate (4:?4SA) is the third in Table II, with v(>loeities of -25-0 km. and +;5() km. for the lirst and second eomponents respe<'tively. It is the onlv plate sivinji any idea of the minimum of the i)rimary or the maximum ot the secondary. The note accompanyins the measure speaks of the secondary as the strong, and the l)rimary as the weak comiionent. This is just the o])po.-ite to what has been found in all other plates. Although as will be seen later, the masses :M2 I'l ItIK \ I 1()\> (iK IIIK DciMlMov i >lt>i;il\ \ 1 1 iH V . (if tlic I\v(i lidiiics arc ii"! very ditTcrtMil. and (•(.n-^c(iucntly the M'coiidary iiuiv shuw >tr()n;;cr tliaii the primary in xinic cax's. A lca>l-Miuarcs Miliitinn was ciiipldyiMl id ini|ii-()\c' llir (■lrnirnl> ulilainnl in ilii> way. Tlii' period, deduced l.y u.-in^ ilic early i.iciv uli-ervations in connection with oiir own. coverinii a y,real nunii.er of cycle-, was taken a> tixed. As liad been previously sunjtoted l.y Dr. Kiny;*. tlie oii>ervati(Uis of liotii component- weic coinhineil into one -el of oh.-ervation equations, from the solution of which oni> one set of elements result. I'or the value of tj ill ilic case of the tirst couiponeiii we must u-e IM) r o) in the second. ."Sixteen oliser\ation e(|uations were formed as lollows:— No. 8 9 10 U 12 13 14 15 IK r.Mii.i, \ unsi;i{\ AiioN ixji .viiHNs i. + 1.2ti.i + \rM + 1-47.T + I..'i05 + .8.S' + .o:n - .4:10 Vt - -UKS 1 • 2I)!I 1 ,'.40 I 47,") -I 374 - .S08 - G31 r -430 - ■ IWi + •484 -t-Ka - 1!1J - • S'M -■Sft.s i- ■ 47t> + •7,').") + 1()3 -■440 -.l.'J4 + 1,57 + -.S.5.') + .,S4<) - 450 + ..521 + .:i!»4 + ■'«() - . 132 - 236 -■423 - 4,-)0 - .(ITJ - Is4 - •370 - U21 T • 12.-, 217 + • 402 + • 420 ^•(MiX + -•73s - ■ 73.5 , ir2S T .;s + 2 -11 SIK) 2(H) 000 700 9(KJ .500 .500 400 51 KJ 400 TOO ! WiMKht. 200 j .VK) j m. 000 ! ,S00 I 1 3 15 2 15 15 13 I 5 1 13 I II I II Where X = 8y 11, =5^'i z = lOUor 100/i57' (i-^)i •P DO vol. I. p. 327 Normal ciiuulioiis wiic dcrivcil Iruiii thi'si' as I'ollows: 21..- +\:i-7'y\iJi I ■.)(.!(/ IV.ilz - W'iH + -229^ + :)S( )() = () + 1SS77//I+ ood//, -1 ■t;i;k - ■:^^^•u +i-7:5(W' -i-ii-2:n=o f U) 7.')2,//.- tiUL' - 'S.V^u +ll44r - l.")t)17 = -t-tltMl: + -KVm - -.WJr +27 ■.■)()'.) = (I + 1S24(( -2(Ht(lr + 2i:i2 = + 4 lis:})' - 4()S(I = Thi' solution of these jjave I =+2- 1711 //, = -;5-4'.)',» ,j. = +i.ti,s,s z = -i;-!!.') u =+2.")()Sl r = -j-lC-.-.S.") wlience, 6, = +2- 17 km. 5A', = -:{•.")() km. S/v. = +1 ■()'.) km. hv =-()til oco = + 14°-71 57' = + -404 day. Ilcncp the correetod values of the elements, r = -489 coi-4°-71 w,= 184°-71 A', = 46-5 A'., = 4S-99 7 =+09 km. T =2,418.411 198 J. D. These new values of the elements reducetl i;/;rr from 042 to W,\, or nearly 28 i)er rent. The af^reement however between the romputcd and observation eciuation residuals was not satisfactory and a second solution was accordinKly carried through. ^- *1 ;;,■> » X'\f^/i);, -J^ fr- ' ,•' ■"''■ '^ : , j.'^i^ " i. .-il>;. :n\ M Ul,l' \I1"N> "^ I""- l>"\"^""^ ..ll>KHV\THliV. N.u „uriuul i.l:i.v> w.Tc foniir,! a^ in TaMr VI i\ni I. \ I NdltMAI, I'l.ACKS II. No. 1 2 3 4 a e 7 8 • 10 11 13 13 U 15 10 MlHTl I'll M,:in \.luiiiv ■.'4 (V.'H ■J.'i Jlii ji; 11711 (1 ir.ii 0-4titi t 4'Jti •_' IV.'C. n >.M' •Jl Tdi'p j.'i j.'ii' ■JCi 1(K) U llili 1) 4jri I Cil U WW +42- 1 +S8-9 +74 +UBO +ti3-3 + 48-5 + -'»U -••5 -.500 -04 ."> -04 2 -S2 -73 -45-5 -31 +30 WriKllf. 1-5 10 3 15 <) ('. 1- - 3-7 + 0-2 + 4-!» + 0» - 10 I'.ilUiilw.ii-l.pluiucri.-. + 10 15 ■5 10 10 4 4 - 16 - 1-3 - 0-2 - 20 + 8-5 -10 3 - 30 + 11 + 4-« Wlu'iici- the ()l)>crv:iti(>u (Miuiitions as l)cU)\v: lAiu.i; \ II. ObfiKltVATluN KC^l ATIONS No. I 2 3 4 5 6 7 8 g 10 II \2 V.i II 1.". ir> W: + .USJ + 1-201 + 1-484 + 1-404 + 1-3U5 + -940 + G.iO - 512 000 . 000 ■ am 000 .(KX) (KH1 -000 -01)0 IMN) IHHI -(KK) -000 -000 -(KM) -000 000 1-Oli) - 1 ■ 20.') 1 IMi - 1 41)4 -1-401 - 'J30 - -0.')() r -.il- - -.V.l'.l - 170 + -444 •421 240 + • + • --774 + •400 f -.5.S'.) + • 170 - 470 --443 - ■ 270 + - 020 + -S10 - 1S5 + -385 + -270 + 019 -118 - 214 --432 --477 -033 --39.') -■2S9 --0OH + •124 + -218 + -4.19 + -.-)03 + OW --5H8 -.538 -OS'J f -218 + •410 + fl.->5 + •577 + •OOl + 023 + - .505 + -001 - 230 --425 --tws - 008 --!K)4 + 7 - 8 + 11 + 2 tt + 2-8 + 10 + 3 - 00 00 + 0-8 _ 1-4 — 2 4 _ 2-5 - 0-7 00 \V,-lKlit, + .;-70o - 200 - 4-lH)0 - -soil + I-IKK) - 1 t(K) 4- 1-000 f i-;i(K) + 0-200 + 2-000 - 8-500 +io-;ioo + 5-000 •000 - 1100 - 4 800 1-3 10 3 15 2 () 15 10 10 with the same substitutions as before. ■* *• .i^ir^-^rV'-- :>*i.i^ •^ *• * -lr^,' n **, 1 • * (IKIIII OK ll.A.( . TiMMl. 345 'llif ii(inri;iU iiliiaimd Irmii llii>c were: — ■ill- i lirsO'.l;/, 7 .".17//, - ■ V.)7: - t Itlir.//, f OOO//; f- ,V)(L- - + l(ISl(V/. t SOS; + .-)I',»7.' + + 1 '.)\>N f-l 21 Ir t. 221/ -1<) i;r.r -i;{ (i22/' - :i us,-)/' + :i (iSOr - ((.■)() = () :)7() = () Ihtl-O 77;{ = () .'lOl =0 7'.l.') = (l from whii-li, .r = •2>S«) (/, =-S(il ,/, = + 1 . :^-.<) z = - ■ li'.t 11 = + \s\:V2\ r =4-12S.");i2 and licncc 07 - + -2i) km. 5/\'i = +Sti km. 6/\, = +1 -^C. km. 5c ^ - .001,-, 5w =+l(r:5".» 57' = + .;{,-,7 (lav 'Vlwsi' gave the second corrccti'd values of the elements us follows: — r = ■ 4S7.') ai, =ir)°io u, =19')° 10 A', =47. "56 A'., =.")() Ho 7 = + -:is 7' = 2,4 1S,4 11 •.").') J. D. The valiK- of Iprc was now rodueed from 46:5 to ;?S0, but still the asrofnient 'netween th(> coniiiuted and observation eciuation residuals was not satisfactory, as will be seen from a glance at the last column in Table VIII. Another least-squares solution was therefore a{)plied, and thi' normal places were apain set np as in Table \TII. :{|t. lc MiiiS-' Hi iiiK lHiMiMii\ m!1-!,1I\ \ !<'HV. No. t 2 3 4 A 6 7 H 10 II \2 l:i II \r, \>> 1 \ni 1 Mil \li|!M \l. I'l \i IX III. M. Ill I'l.ii-.- ■J I Jii'.i ■.'1 >*H1I •ri-7i:i ■.Ml iis:i IIV.l 1 I 111' I 1 i.i.'i II ..T'.i ■J I :il'i ■.'I S'.KI ■.',-, 7 l:i •J(l (ISo I III'. I I if><> I 1,1 id II 'iT'.i M. ,11 \,l,., iiy. +« 1 +,'*■!• +74 + «!) ria :i 1 IH-.". + ■-'".> (1 - -:r, -."ill - 5 7 -.'i - 3 2 15 + S'.l 10 - S-li 15 - 2-5 ■."» + 1-8 10 4- Of) 10 + 3 3 II II II III , II .■,; Ill 111 +0 41 -0 15 -0 14 -0 OJ +01H -0 Wi -082 -0-68 -0 S3 +0.21 +0 11 +0 14 Tn.-li rihscrvntinii (Mniatinn^ wen- formcil as iti tin- fiillowiii)^ tuhlc: — No. 3 4 5 fi S 9 10 11 12 13 14 15 16 + .975 + 1-221 + 1.4.'-.fi fl.4fi5 + 1-415 964 ■fi3ti -.523 mx) IHHI IHrf' -IKIO -000 mo IKKI IKKI taiim; i\ i)iisi:i(v.\rniN i;>ir\Tio\> iir 000 -000 ■000 ■ 000 (KK) IKMI IKNI ;xx) -1 007 -1 225 -l-4.iO - 1 - 465 -1-421 - 9 ',7 - ma + -.'•>23 644 320 347 4H3 422 444 770 473 ■ 6.56 -332 -3,S8 -514 -458 ■497 -819 htr.i + .349 + -•253 + 022 - 113 - -216 -•472 -.527 -006 --361 --•267 - 012 -r20 + ■221 + •507 + .561 + -IIIK") + -•520 --504 -170 + 116 + -343 + -743 + -676 -015 + -.5.-)7 + ■.535 1.58 + •1'24 -348 -790 719 -016 Wi-iRht. + 4 460 -0-700 -4. 680 +0-740 +4110 -2-470 + 1-480 +0 620 + 5 680 +3-220 -8 900 +8-640 +2-4.50 -1 800 -0-630 -::-3iKi V - f 15 +001 10 -001 3 -0 01 1-5 +0 01 2-0 +0-01 1 -.5 +0-04 1-5 00 1-5 -002 -.5 -0-01 -5 +001 1-5 0-00 10 000 15 -001 -5 -002 1-0 -0 01 i I 00 iillllll iiK H \ ( ."SOO ;ii7 rhc IKilliillI ((lUatinii^ li-illlinc were; - -Mx +i;\-2: :{L'S(( + IN '.(I:?!/, f iHii),/, t fi'.ti: 1 i.'i// ^ 10 7:>.')(y, f 1 ■()•_'»-■ smii + .")»;u^ + ■ J7:^/ f 1 7J1(/ "•oUini; tlicsc. t LM-'r tis:, II t ■ Sli.Hr - 1 Itili t MUt/' -;r7(i7 = (» - •7:is/ •J 4'24=() -•J .Mir * .>l(i=(t +;is7:>r r -Olis^u \\ IICIICI', .r = (Mil ,'/i = iin .'/•-■ = HL^i z = ■AVu II = - 1 (IS.") V = — • 7 ">•> h = +()»i km. 6A', = +lM km. 6A', = +-A2 km. Of = -\- ■()i):}7 5c<) = -0^ •()•_' 67' = -021 dav. fjiviti'^ the third corrected values as follows:- I' =2t;-2742 (lays . = ■4912 cc, =14°-4S CO, =194"-4S K, =47- 19 km. A': =')n()7 km. 7 = + -44 km. 7' =2,41S,411 .VU J. I). The valiio of the clcinciits will he seen to ho little changed. The value of I'/i/r was found to ho rodueod very slishtly, from iiSO to 378, hut the agroomont hotween the oomputod and ohservation ef|uation resiihial.s was now e.xcellent. as may ho seen in Tahle IX (v~r'), and these elements were ai-cepleu as imai. i iic loiiowing tahle contains a summary of the preliminary, 348 ITHI.K AIKINS (W rm; DoMIMDN ollSKIiVATOin . first, xrnnd an.l tliinl .■(.rnrtcl values. l.wtli the observations of the p.'imary and the douhh- circle- iho-e of the secondary component. The I.ick ol.servations are .shown by an 1. within the circle. Dominion Observaiory, Ottawa. June. 19].".. OKBIT OF B.A.C. ')S9(). MW (\ 1 1 Q 1 ,---- A. / — • ' ,''■ - --.^ '^> / \ \ / / / ■ > / V /V / \ / X ^ \ \ \ ^ 1 \ \ \ i / 1 ©1 9 1 1 1 Y \ ^ 1 i F 1 1 i 1 1 \ 1 1 1 » 10 1^ 14 16 18 2.1 22 24 26 28 3J \ Kl.OCITY Cl-RVE OF B. A. C. 5890.